The best way to think about the economic geography of the Americas in this day and age is to split the region into three categories. These categories would be rich countries, middle-income countries, and poor countries. The dividing lines between these categories are not necessarily completely clear, but the basic idea of categorizing countries in this way is sound.
In the Americas, there are two countries that are truly rich. These are the United States and Canada. These countries have per capita gross domestic products that are far higher than those of any of the other countries of the region.
After these countries, there are a number of middle income countries. Many of the larger countries of South America are included in this category. These are countries like Brazil, Argentina, and Mexico. They have per capita incomes that are somewhere around one-third to one-fourth of those of the US and Canada, but are still significantly higher than those of the truly poor countries.
Finally, there are some countries in the Americas that are truly poor. Perhaps the clearest example of this is Haiti. However, other countries such as Nicaragua and Honduras have GDPs that are among the lowest in the world.